Enthalpy of combustion of acetylsalicylic acid

Low-temperature heat capacity and standard molar enthalpy of formation of 9-fluorenemethanol (C14H12O)

“…Briefly, the calorimeter was mainly composed of a sample cell, a miniature platinum resistance thermometer, an electric heater, the inner and the outer adiabatic shields, two sets of six-junctions chromel-constantan thermopiles installed between the calorimetric cell and the inner shield and between the inner and outer shields, respectively, and a high vacuum can. The sample cell was made of gold-plated copper and had an inner volume of 0.006 dm 3 . Four gold-plated copper vanes of 0.2 mm in thickness with a X-shape were placed into the cell to promote heat distribution in the sample cell.…”

“…The oxygen bomb was made from a special stainless steel with good heat conduction. The efficient volume of the bomb was about 0.3 dm 3 . Two stainless steel ignition electrodes of 0.8 cm in diameter were extended to the centre of the bomb downright from the lid of the bomb.…”

“…Except for the two ignition electrodes, a filling-oxygen valve was also mounted in the lid. A small sample crucible of about 0.004 dm 3 was hanged in the bomb by means of a horizontal ring. The ring was vertically fixed on one of the two stainless steel electrodes and in a good electric contact with the sample crucible.…”

“…The thermostatic bath was made from the stainless steel plate of 5 mm in thickness, on the surface of which the thermal insulation paint was coated. The volume of the bath was about 60 dm 3 . The thermostatic medium is the distilled water to protect the inner calorimetric vessel from the corrosion.…”

“…The standard molar enthalpies of formation, together with the standard or specified entropy, are equally important data in determining any chemical equilibrium. In the present paper, a precise and computer-controlled isoperibol oxygen-bomb combustion calorimeter suitable for investigating combustion enthalpies of many novel compounds is described in more detail on the basis of other commercial apparatus [3][4][5][6] and our previous works [7,8]. The standard molar enthalpy of formation of the 9-fluorenemethanol has been derived from the combination of the result of the standard molar enthalpy of combustion with other auxiliary thermodynamic quantities.…”